Method of making labyrinth seal lips for the moving parts of turbomachines

Abstract

In order to make labyrinth seal lips on the periphery of a metal moving part of a turbomachine, a thick layer of refractory material that adheres to the metal is made prior to assembling the moving part, the refractory material advantageously comprising at least one metal selected for example from Fe, Co, and Ni, together with at least one ceramic selected for example from borides, nitrides, carbides, and refractory oxides. The labyrinth seal lips that are to be made are machined to their final dimensions in the deposited thick layer.

1 - 9 . (Canceled)  
     
     
         10 . A moving part forming a metal turbomachine rotor presenting labyrinth seal lips at its periphery, wherein the lips are machined in a thickness of a layer of refractory material adhering to the metal.  
     
     
         11 . A moving part according to  claim 10 , wherein the layer of refractory material comprises at least one metal selected from the group consisting of iron, cobalt, and nickel, together with at least one ceramic.  
     
     
         12 . A moving part according to  claim 11 , wherein the ceramic is selected from the group consisting of borides, nitrides, carbides, and refractory oxides.  
     
     
         13 . A moving part according to  claim 12 , wherein the refractory material includes alumina.  
     
     
         14 . The moving part according to  claim 10 , wherein the thickness of the layer of refractory material is greater than 1 mm.  
     
     
         15 . The moving part according to  claim 10 , wherein the refractory material of the layer of refractory material is in the form of an agglomerated powder of powder mixture.  
     
     
         16 . The moving part according to  claim 10 , wherein the layer of refractory material is deposited by thermal sputtering.  
     
     
         17 . The moving part according to  claim 16 , wherein the layer of refractory material is formed by plasma deposition.  
     
     
         18 . The moving part according to  claim 10 , wherein the layer of refractory material is formed by brazing onto the metal.  
     
     
         19 . The moving part according to  claim 10 , wherein the thickness of said layer of refractory material is less than a height of said labyrinth seal lips.  
     
     
         20 . The moving part according to  claim 19 , wherein a major portion of said height of said labyrinth seal lips is made of said refractory material.  
     
     
         21 . The moving part according to  claim 10 , wherein the thickness of said layer of refractory material is greater than a height of said labyrinth seal lips.  
     
     
         22 . The moving part according to  claim 10 , wherein a height of said layer of refractory material is approximately between 2 mm and 8 mm.  
     
     
         23 . The moving part according to  claim 10 , wherein a powder to make said layer of refractory material has a mean particle size less than 100 μm.  
     
     
         24 . The moving part according to  claim 10 , wherein said layer of refractory material is locally diffused into the metal.  
     
     
         25 . The moving part according to  claim 10 , wherein said layer of refractory material is a single layer.